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P. ELGRISWOLD Shingle-Cutting Machine.

No. 224,333. Patented Feb. 10, 1880.

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U ED T PAT I E 'PARDON H. cntswonn, or TonAvvANDA, new YORK.

ISHI'NGLLEH-ZCUTTING MACHINE.

sPEcIFIcA'rroN' forming part o f: Letters Patent No. 224,333, dated Fbmar '10, ,18s0.

Application'filed July as, 1879. l

To all whom it may concern:

Be it known that I, PARDON H. GRrswoLn, of Tonawanda, in thecounty of Erie and State of New York, have made certain Improvements in Shingle-Machines, of which thefollowing is a specification.

This invention relates to machines for cut ting shingles by a rotary movement of the cutters or knives. Such machines usually operate longitudinally or flatwise. The machines now most used are those having only a single knife with a vertical movement, by which the blocks of wood are cutfirst on one side, then turned and cut on the other, always leaving what is called a spalt or refuse piece in the center, which is either thrown aside or else has to be worked into shingles by hand or in a separate machine.

vThe object of my inventionis to do away with this turning of the block and cut itall up in one operation, leaving no spalt also preventing the cracking or checking of the shingles also, to present a machine that will out a great many more shingles in a given time than is now done by other machines, and more shingles out of the same amount of tiniber; and the invention consists in attaching totwo upright circular frames (having a rotary motion on a central axis) a series of two or more knives or cutters at or near the periphery of said frames and set at regular distances apart, each knife cutting out from the block a shingle as the frame rapidly revolves.

It further consists in arranging in connection with each knife a pressure bar or roller, each of which is set at a slight angle to and below each knife, the knives being set straight on the frames and the. pressure-bars angling, as fully hereinafter explained.

I11 the drawings, Figure 1 is a side elevation, showing one side of the circular frame, the knives and pressure-bars in cross-section. Fig. 2 is a sectional front view of the circular frame, showing two cutters and the position of two pressure-bars A A represent two upright circular frames or spiders revolving on a central axis, a, in suitablebearings. b b are a series of two or more knives or cutters, which are fastened in any suitable manner ator-near the periphery of and across the two frames, and which, as

the frame revolves, cut the shingles from the block of timber 13, each knife cutting its own shingle, the segmental circular lines shown in Fig. 1 in the side of the block indicating the successive cuttings or rifts, the block being completely and entirely out up into shingles,

without leaving a spalt or having to be turned over at all, thus saving in time and timber, the number of cutters acting with great rapidity on the blocks, thereby making many more shingles perday than is now accomplished by other machines, and also 1n akin g m ore shin gles from checking-that is,- cracking or splitting-while being cut, which is a great disadvantage and loss by the usual method of cutting, a smooth and perfect shingle being, of course, the most valuable.

Each pressure-bar is set at an angle to the cutter above it, and alternating the angle so as to conform to the shape of each shingle as it is out from the block, and to give an equal compression the whole length and width of each shingle. As the side of the block is presented at alternate angles by the feed, 1 set these pressure bars or rollers at similar angles to meet the feed-'-that is, one end of a pressurebar will be set quite close to the knifethe end that cuts the tip-and the other end of the bar set a little down from the knife, as shown at d, Fig. 2, where the butt of the shingle is cut. The next pressure-bar will set at an opposite angle, as shown at d, and so on through all the bars.

I am acquainted with a single straight pressure-bar in connection with a single vertical knife, but none on a rotary frame in connection with a series of cutters or that set angling. Neither am I acquainted with a machine that cuts the block entirely up without leaving a spalt or shingle-block.

By the use of knives set straight and the pressure-bars set alternately angling thereto, a pressure is got the whole length oftheshingle as it is cut-a result not hitherto accomplished, so far as I am aware, but very important in making a good. shingle. The pressure now obtained by other machines is only onehalf the length of the shingle, which only partly prevents checking. By this arrangement of knives and pressure-bars the same knife always cuts the butts and tips in one position, (not alternately, as in other machines,) and the following knife cuts the shingle in the opposite direction.

I claim- 1. In a shingle-cutting machine, in combinanation with the two upright circular framesA A, the series of knives or cutters b 1), arranged across the frames in a suitable manner at or near their periphery, so as to cut the shinglesfrom the block B as the frame "revolves,

each cutter having, in combination therewith,

a compression roller or bar, a, suitably at- 20 PARDON H. GRISWOLD.

Witnesses:

' J. R. DRAKE,

HENRY GAUsoN. 

